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26 MOEPHOLOGY AND EVOLUTION
may represent the parieto-occipital sulcus of the higher Primates. And the intercalary or calloso-marginal sulcus tC.-il.S.), is separate from it.
The cerebellum is mostly uncovered by the cerebral hemispheres. It is simple in character, and has well-
The brains of the Lorises, Galagos and Pottos are even smoother than those of the true Lemurs, but the same general characters are present.
When the cortical centres are investigated it is seen how the visual areas in the occipital part of the brain are extensive.
The brain forms J$ to ^ of the body-weight in the true Lemurs, whereas it only forms T^ of the body-weight in some of the Carnivora, which rank next to the Primates in the size of the brain.
Sub-order TAESIOIDEA (Fig. 5).
The Tarsiers are diminutive creatures inhabiting some of the Malay islands. They have immense eyes; pointed ears and a tufted tail; but the snout is reduced, thus bringing the eyes more to the front of the head than in the Lemurs. They have two curious habits—they can rotate their heads till they look directly backwards; and they leap from bough to bough in a frog-like manner in search of insects.
Hands and Feet tfig. 6).—The long, slender fingers and the short thumb are terminated by expanded pads, thus resembling the digits of the Geckos; and the intermediate and proximal pads are separate. The nails simulate claws. In the foot the toes and the large